Regarding PCB fabrication: Way back in the 1970's, I etched some PCBs using spray-on photoresist and a graphics overlay to define the pattern. I didn't have a UV lamp to expose the photoresist so I did the work on sunny days and used sunshine as my UV source when the sun was well overhead. Worked fine.
@Edisson.11 ай бұрын
WOW great measurement, I ran into the wavelength problem while rebuilding my exposure unit for pcb fabrication. I originally had fluorescent tubes installed there and wanted to install LEDs after their useful life. However, as I found out, the given wavelength parameters for some LEDs do not correspond at all, and some types were only violet light. Unfortunately, I don't have a spectrometer at my disposal to be able to make such precise measurements, so I ordered several different LEDs and tried to illuminate the pcb with them. When I was still working in research laboratories, one of my specializations was pcb production, for illumination I used a huge reflector with eight special RVL lamps and a vacuum table to anchor the boards - this sophisticated solution cannot be applied in domestic conditions, and moreover today it is not a problem to order a pcb - although it takes a while, but it's done without a bathroom mess and breathing in chemical fumes. Today I only use two 10W UV lamps (two LED 1800lm chips in the lamp) for curing glues and solder masks - I don't remember the wavelength, but they work luxuriously. Nice day 🙂 Tom
@RonDogInTheHouse11 ай бұрын
Years ago I had a similar issue. I wanted to build a PCB UV exposure unit using LEDs, never did get it to work. Eventually I gave up, more like I ran out of money trying different LEDs that didn't work, I suspect due to the inaccuracies of the wavelength. I bought some USHIO F8T5BL fluorescent lamps, ballast and starters. Added an adjustable countdown timer and the dang thing works great. I use it to this day to get my prototypes up and running the same day. Developer: 1/4 tsp to 350ml water (like how I mix imperial and metric) Etchant: 2 parts 3% H2O2 to 1 part 31.45% HCL Spent Cupric Chloride is dropped off at a local hazmat center (free to residents) I know I could reuse the Cupric Chloride, I just discard it, it's so cheap to make a fresh batch.
@Edisson.11 ай бұрын
@@RonDogInTheHouse Hello, at work I used the so-called Grafolite, i.e. Iron Chloride (you can buy a prepared solution directly for etching plates) and if I needed something small quickly at home, then HCL - hydrochloric acid + 30% hydrogen peroxide - when fresh, it etches incredibly quickly but smells terribly , you have to watch it, otherwise you have a nice FR4 pad 😂 For a little etching at home (today I prefer milling it) I made a tempered swing - a heated plate that is anchored on one side to silent blocks and on the other side to springs with a motor-driven cam - etching the bath thus becomes slightly undulating and the plate is rinsed during etching, in addition, the heated solution etches better. As a light-sensitive material, I used a specially diluted solution of SCR or PLD to apply to the plates, depending on what I needed to achieve during development (positive or negative development - illuminated areas disappear, or on the contrary, they remain and disappear unilluminated). I didn't make the LED lighting, but I bought new tubes - I don't remember the type. Only white LEDs remained in the exposure unit, which are used to align templates for double-sided plates, all complete with a digital timer. Nice day 🙂 Tom
@douro2011 ай бұрын
365nm LEDs are still quite expensive- especially if you need ones with very high luminous flux in the single watt range. It also doesn't help that the makers of the currently highest performance ones- ams OSRAM- announced that they will no longer be producing them.
@Raymond-Wu11 ай бұрын
Ah that's too bad. Guess their LED Engin acquisition didn't do too well. There's always Seoul Viosys
@rankenfile11 ай бұрын
Nice tool for verifying your lights. Hope you find actual 365's
@IMSAIGuy11 ай бұрын
yes, I found a really nice one
@earlyadapter64311 ай бұрын
I'm exposing PC boards under a plastic shell with UV LEDs that is originally made for photopolymerizing nail paint. It was advertised as having 2 wavelenghts LED but i don't have the box with the specs here right now. It has a built in timer and i do 200 seconds.
@lmamakos11 ай бұрын
OTOH, the engraving on the case of the flashlight looks nice!
@IMSAIGuy11 ай бұрын
it definitely looked the part
@biniouhamoto123611 ай бұрын
Thanks for the video 👍 Very practical device It would be good to analyze different commercial LEDs to see their color spectrum
@retireeelectronics264911 ай бұрын
Not bad having a Ocean USB2000 on hand, sweet.
@andrewverran349811 ай бұрын
Hi , completely unrelated post...I am going to look at a second Hitachi V1100A 100mhz digitising oscilloscope , is it possible to use NanoVNA and a TINY SA to quickly test tge scope? and how would you recommend testing with one or both device? Much appreciated PeaceFromOz😊
@IMSAIGuy11 ай бұрын
the nano won't be much good. the tinysa has a RF generator mode that you could use
@JamieTyson8 ай бұрын
I use Dymax brand UV adhesives, and many of them are designed for 385nM! So not a bad find, really.
@3cu14rs10 ай бұрын
Which direction would the wavelength move if you overdrive them?
What can you do with a 365 that you can’t do with a 385? Also, I wonder if you’ve ever opened up your photometer to see how it works.
@IMSAIGuy11 ай бұрын
many materials only fluoresce at specific wavelengths: kzbin.info/www/bejne/m6GtYnZofMlspKssi=SBBuWjxihMEtJUc0 kzbin.info/www/bejne/d2W3cn6sr8Rga6ssi=SMoGyskdztNghZBb kzbin.info/www/bejne/gIbNmYhvqbqMhM0si=SvnG-zLw3RxJbnWZ
@IMSAIGuy11 ай бұрын
the insides is a diffraction grating and a linear CCD. I did a video on monochromators: kzbin.info/www/bejne/oHnWgqt8oamofrMsi=sF2ruLHwuAVjyuqF here is the USB2000: www.ece.ualberta.ca/~lpfs/uploads/manuals/Ocean_Optics_USB2000.pdf
@gorak90007 ай бұрын
@@IMSAIGuy Heh, love that the manual is from random page on ece ualberta ca - that's where I did my undergrad and MSc! I definitely used a USB-2000 in my MSc project to characterize some LEDs I was using as a light source to evaluate photodetectors. It's funny that the USB-2000 software doesn't run in modern OS'es, but on the bay they're still going for 800 or more!
@Raymond-Wu11 ай бұрын
You're always welcome to build a 365nm LED light out of the parts I sent you!
@IMSAIGuy11 ай бұрын
I could, I ended up getting a really nice 365 with UV filter in the front and uses a 26650 battery. $18
@Raymond-Wu11 ай бұрын
@@IMSAIGuy glad it worked out for you then. Most sellers have no idea when it comes to uv so it doesn't surprise me that you got 385nm. You can find 365nm at that price point but it doesn't hurt to splurge a bit more
@christopherjackson215711 ай бұрын
I also have to run vm's of old windows versions to interface with test gear haha Tbh it's probably best a lot of that buggy old software, typically with networking functionality, isn't exposed to a networked os anyways
@GeorgeGraves11 ай бұрын
I wonder where the lying about specs starts and ends. Does the componet manfacture lie? Or is it the reseller? Or is it the US facing reseller that fibs the number? Or does everyone tack on 5% and it just kinda snowballs.
@deepblueskyshine11 ай бұрын
Chinese fans of arab children's stories sell a pack of 10 real 365nm diodes rated at 0.9A, SM soldered on aluminum "star" PCB sized by your choice that at 0.4A on a large radiator are boiling hot for around $20 without delivery. Better ones are about twice or more as much. For photoresist curing, the ones intended for reimbursement are OK, as well as 400nm ones, though it takes longer. With the "boilers" I've mentioned above, run at 0.35A depending on the photoresist 's or solder mask quality it takes less than a minute, fresh photoresist film usually around 20 seconds, often less.
@ankurgupta423511 ай бұрын
I remembe watching another video on UV lazer, which was changing its wavelength with temaprature. I know yours is not Lazer, just LED, but can you still test it before returning? That would be really interesting observation. Ref: kzbin.info/www/bejne/b6WylIivltCeZrM
@IMSAIGuy11 ай бұрын
I did a video; kzbin.info/www/bejne/rXOceoaVprd_rpIsi=hotMH-0gxhjceQ7J
@wiwingmargahayu683111 ай бұрын
Nice Lithium battery size Sir hope its mass produce
@IMSAIGuy11 ай бұрын
?? these are AA
@BryanTorok11 ай бұрын
If LEDs produce light at just one wavelength, why does the meter show a gradually increasing and decreasing graph? I would expect a very narrow spike.
@IMSAIGuy11 ай бұрын
lasers have single wavelength, LEDs have some width to the spectrum
@BryanTorok10 ай бұрын
@@IMSAIGuy Thanks for the clarification.
@charlesnelson61910 ай бұрын
Lasers produce wavelengths very closely spaced (MHz between them). You can use a Fabry-Perot Interferometer to measure them. Some lasers are better than others for the number and strengths of the multiple wavelengths. I'm sure equipment is better than in the 1970s when I did it. 🤣
@mechanoid573911 ай бұрын
A Chinese product not what it says it is! Shocking!
@Homer1952111 ай бұрын
So about 5% difference. What is the gauge R&R of your system & what is the spec for the device? Given both measurement error & device spec, seems close enough. No???
@IMSAIGuy11 ай бұрын
No: many materials only fluoresce at specific wavelengths: kzbin.info/www/bejne/m6GtYnZofMlspKssi=SBBuWjxihMEtJUc0 kzbin.info/www/bejne/d2W3cn6sr8Rga6ssi=SMoGyskdztNghZBb kzbin.info/www/bejne/gIbNmYhvqbqMhM0si=SvnG-zLw3RxJbnWZ
@IMSAIGuy11 ай бұрын
a good example is the UV ink on a $100 bill. only works at 365
@lmamakos11 ай бұрын
@@IMSAIGuy OH! That's really good to know! Now I have a means of testing the purported 365nm LED flashlight that I bought to cure resin to see if it's the real deal. All I need now is a $100 bill.
@andymouse11 ай бұрын
Hmm wonder if thats true on our UK money...cheers.@@IMSAIGuy
@peterrhodes566311 ай бұрын
@@IMSAIGuy Plenty of US$100 bills in South America that don't respond to that test. They use a cheaper ink on their 'home made' ones. They call them 'falso's' in Peru.
@dbuezas11 ай бұрын
What was the actual frequency of the should-be 365?
@ivolol11 ай бұрын
~387, probably just another 395nm LED
@IMSAIGuy11 ай бұрын
2:39
@zer0bytes200011 ай бұрын
I have one from Manufacturer DARKBEAM Part Number A300-03-365nm 1 pack Item Weight 3.67 ounces Item model number A300-03 Seems right to me, but I don't have a light spectrum analyzer.
@andymouse11 ай бұрын
What are you using then, maybe the MK2 eyeball? :)
@zer0bytes200011 ай бұрын
@@andymouse the what? i have no clue what that means. thanks
@zer0bytes200011 ай бұрын
@@andymouse things glow and are visible to me with that light as well as another light that is 365nm as well, so yes, my eyeball. I don't know what I would test on to "see" the "difference" with my eye. maybe there is something common to use that only glows with 365nm? thanks
@andymouse11 ай бұрын
It was just a bit of humour ! no problem😁😁@@zer0bytes2000